Safety-latch for board drop-hammers.



H. E.. DERBYSHmE.

SAFETY LATUH FOR BOARD DROP HAMMERS.

APPLICATION FILED NOV. 1, 1911.

Patented Sept. 3, 1912.

www A PATENT oiirioit.l

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To all'wwfrl it AfBe it known that I, HENRY E). DERBY- p sarna, acitizenof 'the United States', re.-

siding in Chambersburg, Pennsylvania, have ,invented certainImprovements in ,Safety-Latches for Board Drop-Hammers,

ofwhich the following is a specification. One object .ofmy invention is`to provide aconveniently operated and relatively'siin-- ple supportingdevice for temporarily preventin movement 'of the bar which con'- trolst e-'action .of the lifting rolls of a board dro hammer in order -torender posble. This object Ivattain in the following.

i'nanner, reference being had to the acc0m- 4, are side elevationsof-the safety latch' panying drawings, inV which Figure 1, is a frontelevation of a board drop hammer, showing my invention as appliedthereto; Fig. 2, is'a side elevation of the hammer shown in Fig. 1;Figs. 3 and and its operating lever, lshowing the parts intheirinoperative and operative positions respectively; Figs. 5 and 6, arefront eleva-v tions of the parts shown in Figs. 3 and 4A respectively.

In the accompanying drawings, 1rep-re-v sents the base of a hammerhaving side frames 2 providing guideways for a rain 3. On these framesaret mounted Vliftin rolls 4 and 5 which, under operating con itions,may be made to co rate to en age the lifting boartl 6, whic isattachedlto the ram 3 to raise the-I'atterJf Said rolls are mounted onde'centrics carried in the well known manner by the frames 2 operated by;

a lever ,7 to cause said/rolls te engage.A 0l' disengage the liftingboard 6 Said lever is actuated through a bar 8, which/has clamped to ita knock-o" bracket 9 and 'a -mnt 182i Under these-'conditions the end ,i

'o Lthe short arm of thel levier...A 17 engages the lower-end 0fthe-lifting' 13h38 and efv roll release lever bracket 10 on which therelease lever 11 is pivoted. A treadle .12 is pivoted to the base of theframe'l and has connected to. it along rod 13,. acting through a lever14,' to operate a pair o f clamps, whereby the lifting board and the ramattached thereto may-be held in the raised or up r position. Underoperating conditions, t e ram upon reach/ing a point near the bottom ofits stroke,'engages the` ,pecieatlon of Letters Patent., .applicationfiled November 1, 191'1.

Patented sept.- '3. 1912.

Serial No. 857,937.

shown in Fig. 2, the board is grip e by the clamps 15 and -retained in'raise position.

o eration in order -that the die may be c anged or.that any desiredadjustment may be made wi said bar 8 vis unreliableaiid dangerous, sinceconsequentl unintentional operationof the order-to preventthe ossibilityof such anaccidental starting ofthe hammer, I provide a hand lever 17ivoted to the frame at 18 and provided wit notch provides an abutment18l fora bar or the outer eid of the said shortarm. This hand lever andthe latch are so placed that .under working conditions they may be op'-arm ofthe 'levervl raisesv its short arm from 'the osition shown in Fi3` to that shown in ig. 4, and permits t e latch 19 toas.- sume ,asubstantially vertical position with its upper end in engagement withthe abutfectually vprevents it from` dropping from .vided by the. frame,lwith itsvu end centwhich it strikes t e leverll'and sov outof actionand the ram is freeto fall and- If it bedesiredvtop'ut the machine outof' thout danger tothe operator, it is necessary that the bar 8 bepropped on fixed,A in its upper position and such proppig otif the prop,or other holding means, should4 be accidentally dislodged or removed,the

hamfner would endanger1 the operator. In

a notch in its, short arm, as indicated in Figs. 3 and 4. 'This' `eratedto lockjthe bar 8 in its r"ised1pos1. tion. The downward movement f thelong its raised'positiomwhile the strut orv latclr 19 engages thesupporting ledge 20 pro-.

knock-off bracket 9 and causes the lower v l orting shelf 16 so thatvitdrops and thei'esoy the rolls to release the lifting board. -If the 'ithough ifsaid treadle be in the position- ,strut19 forminga latch whichis pivoted to against 'the abutment 1'8", as'note sgthatf; j the lever,1 7, with the' lifting vbar 8, are effectnallytlbckedin position,` Thevarious.'

uit

parts are soarranged that under these con-r ditionsthe' 'upper end ofthe strut or latch: 19 enga es the abutmentrin such manner thatv itsower end rests a little to one side '5 of the perpendicular so that.,therefore, it has"4 no tendency' to become dislodged.

When it is`desired to againplace the m9.--

chinein operation, the lever 17 -s pulled down'for a short distance,thereby taking the strain .fro'mthe strut 19, which may then be moved onits ivot until-it is substantially parallel wit the arm 17, whereuponthis ,latter is given its normal position shown in Fig. 3. -`4Inasxnuchasthe latch orestrnt is permane/ntly fixed by. means of the pin 21, onthe arm of the lever 17, the device is always rea-dy for operation andin no way-interferes with the Working of the machine under ordinaryconditionss 1. The combination in a drop hammer of .the hammerliftingrolls, a bar lfor control ling the lifting rolls; with a handoperated safety latch vmounted to positively retain said barin itsraisedositlon..

2. The combination 1n a dro hammer of the'hammer; lifting rolls; a:1r-for controlling the lifting'rolls; a `device forposi- 3 tivelyretaining said bar in its raised position; and ai handfactuated memberfor? o@- erating said device. v

. O e v .3. The combinatlon 1nA a drop .hammer fof j the hammer; liftingrolls; a barf'for controll lin the liftingrolls; a-latch for retaining3,54

sai bar" in its elevated position; and a. le-

'ver foroperatng said latch. f v 4. The combination in a drop hammer ofa fra-me, a: hammer; lifting rolls, a roll controlling bar; a leverpivoted to the frame of 40 the hammer; and a member pivoted to the leverin position to coperate with said frame to positively holdthe v-1bar inits elevated position@ or to 'permite movement'bf said bar. '15 5. Thecombination in a drop hammer: ot a frame having a ledge, hammer litt-ingrolls; -a roll controlling har; a lever nivuted to said frame and havingan ala" "ment on one of its arms; with a latch piece givot'ed-rto 50said lever arm adjacent said abutmentin po- 'sition to he moved betweenthe roll control- .l ling bar and the ledge on the frame. n

In testimony whereof, I have signed myname to this specification, int-hepresenceof two subscribin witnesses.. HENR- E. DERBYSI-IIRE.

Witnesses:

A. A. Loilmaxnn, SARAH T. FROMMEYER.

